The hypothesis of this study is that patients diagnosed with degenerative disc disease treated with an anterior lumbar interbody fusion, anterior only surgical approach (incision through the abdomen), using InQu Bone Graft Extender and Substitute and instrumented fixation have comparable radiographic (x-rays), functional (daily activities), and clinical (how the patient is doing) outcomes when compared to published data for use of InFuse in stand-alone fusion.